Water

• What should you be able to describe by the end of the video?

  How to analyze and purify water
• What is potable water?

  Water that is safe to drink
• How does pure water differ from potable water?

  Pure water has no dissolved solids
• What is the pH of pure water?

  7
• What does a pH not equal to 7 indicate?

  The water contains dissolved acid or alkali
• How do you check the pH of water?

  Use universal indicator paper
• What does an increase in mass of the evaporating basin indicate?

  Presence of dissolved solids in water
• What happens to dissolved solids when water evaporates?

  They form crystals on the basin's surface
• What is the first step in testing water purity?

  Check the pH of the water
• What is the purpose of distillation in water purification?

  To remove dissolved solids from water
• What is the process of purifying water by distillation?

  1. Heat water in a conical flask.
  2. Water evaporates and forms steam.
  3. Steam travels through a delivery tube.
  4. Steam condenses in a cold test tube.
  5. Collect distilled water, which is pure.
• What does distilled water contain?

  No dissolved solids
• What is the pH of distilled water?

  7
• Why might water still not be pure after testing for dissolved solids?

  It may contain dissolved gases
• What equipment is used in the distillation process?

  • Conical flask
  • Delivery tube
  • Test tube
  • Bunsen burner
  • Ice and water beaker